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Offered in Mx8bit, the K9F4G08U0F is a 4G-bit NAND Flash Memory with spare M-bit. The device is offered in V VCC. Its NAND cell. K9G8G08U0A Datasheet, K9G8G08U0A PDF, FLASH MEMORY. K9G8G08U0A datasheet, K9G8G08U0A datasheets, K9G8G08U0A pdf, K9G8G08U0A price, K9G8G08U0A buy, K9G8G08U0A stock.

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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I have never seen any flash chips with capacity not confined to the strict i. I wonder what prevents manufacturers from creating such chips: I’ve came to this thought after examining some flash drives: For example, plugging an SD card labeled as ” MB” into my Linux box produces the following message:. It is not formatting nor partitioning overhead: I don’t consider it as “extra” or something because:.

So, what prevents a vendor from adding a bit more rows or columns? So the silicon usage efficiency is best at 2 n.

NAND Flash > MLC-large Block

Further, if you intend to put several of them together in a parallel access scheme, you will end up with gaps if each chip doesn’t datashest 2 n. If you need to create a device with memory in the range 2 n and 2 n-1 then you will generally find that buying fatasheet 2 n part is more cost effective than buying the 2 n-1 part and a smaller part.

Manufacturers have the same issue dagasheet producing silicon dies. Yes, they could make one, but it wouldn’t increase their bottom line.

I’ve actually seen lots of devices that are not only not powers of two, but not even non-power-of-two multiples of power-of-two blocks. Sometimes – as with those packaged in USB or SD devices it’s easy to assume that the controller you access the memory through is reserving space to map out bad blocks, etc.

But I’ve also seen SPI-interface flashes where the actual native block size was not a power of two, but actually a bit larger – for example, the AT45DBD has pages that you can set as being either or bytes long. The word is deceit, and it also happens with hard disks. If you buy a 1TB hard disk and it appears to hold 1 MB, technically you’re not swindled, even when you actually did mean and expected 1 MiB.

Giving you more than the absolute minimum would cost them a few cents extra. Data for the WD Caviar Blue drive, but other manufacturers will handle more or less the same numbers: The factorization of the number of sectors shows that there’s no logic in it, the numbers are chosen to give a round number in GB, not GiB. The difference between 8 GiB and 8 GB can also be formatting overhead.

The error-correction logic doesn’t count in either number.

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Home Questions Tags Users Unanswered. Is flash chip capacity really limited to the powers of 2? For example, plugging an SD card labeled as ” MB” into my K9g8y08u0a box produces the following message: I don’t consider it as “extra” or something because: It is almost always used to datasbeet the ECC codes and not the actual data; hence, the amount of information is same with or without OOB.


The count of pages and blocks in entire flash is still power of 2, and moreover, amount of bytes in data and OOB areas of page on datasheef own is power of 2, too. While the latter may be very well justified by minimizing overhead of addressing, the former is puzzling for me. We already have RAS and CAS, with one’s address space bigger than other, and the matrix is already asymmetrical — why do it exactly in the power of 2?

There’s little advantage to supporting sizes between 2 n and 2 n Actually, the flash chips used in silicon drives generally have a size which is a power-of-two multiple of While silicon efficiency might be better with a “straight” power of two, drives often need to store blocks which combine bytes of data with a small quantity of bookkeeping information. If memory chips used logical pages of bytes each rather thandrives would have to store a page worth of bookkeeping information beside each page of data–a massive waste.

Many of them, however, dataseet this because they simply have too many bits due to their 3 bit per cell MLC flash. Some other topologies, such as 3D stacking, also result in odd factors. In these cases the best efficiency comes down again to addressing according to the flash topology.

Further, in the rush to increase capacity some reliability is exchanged, but fixed with error detection. So while a unit may have three bit cells, it only exposes three bit cells, and corrects a few bit errors per block.

NAND Flash Table

The convention of flash chips having byte blocks goes back into the s; it’s not just “some newer chips”. Yes, ECC has been around for a long, long time, and thus flash manufacturers do support it. They aren’t uncommon, but they are really only used when robust error correction and detection is required.

They are typically more expensive than the byte block size parts, though, which again points to cost efficiency of silicon being the reason most flash favors power of two.

However with newer 3 bit per cell MLC flash the cost difference isn’t as great, and the need for error correction is greater. But yes, not all flash is power of two. Although manufacturers recommended using part of the space for ECC, the primary purpose of the space was to facilitate block remapping.


When the PC writes a logical sector, the page holding data for that sector will not be immediately erased. Instead, the SmartMedia driver will write the page data to a new page, along with its logical sector number and related information. Can you provide a few examples? I’m curious to look at the datasheet I believe I did provide an example.

K9K8G08U0A Datasheet(PDF) – Samsung semiconductor

Oh, I’m very sorry, my comment should have been much better 3AM, you know The chip you’ve shown is pretty standard compared to what I’ve seen: If it had, for example, pages, then it would be the one I’m searching for. I didn’t say it’s not standard, but it is not a power of two.

If you look at how access to it actually works, a decision to designate those extra 16 bits for “out of band” usage would be your decision, not something forced on you by the architecture of the device. That’s how pretty much all NANDs are done. Sorry, but this is simply wrong. But the capacity of mass storage device is less than that of the flash because of spare blocks which will be used in place of bad blocks, which are present on any new MLC NAND device and are appearing through its life.

Second, the NAND Flash have a standardized interface where interaction with external controller is done through a 8-bit bidirectional bus. Row and column addresses already exceed the bus width, and several transfer cycles are used to select a block; they do not fill all 16 bits as well, so there is already some extra space. This interface is not strictly serial, as there are 8 parallel lines of data, but it’s not parallel, too, as you cannot set up all the address on just that 8 pins.

Coincidence that this is just above ? I don’t think so. It may or may not be a coincidence; but in the question, I ask about flash chips, not flash cards. The capacity of flash cards is just a consequence. There is no practical reason that couldn’t be done. I’ve updated the question with an example. The error-correction logic in form of ECC codes does not, of course, as it uses OOB area, but error correction which replaces bad blocks with spare ones does count.

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